This feature searches through the system registry and looks for shared DLL's (Dynamic Link Libraries) to find references to DLL files that have been removed from your system.

These references are no longer needed because the file isn't there anymore.

This feature does check to see if the DLL file exists where the registry entrys say it does. If it doesn't exist, it is then considered and invalid entry.

For safety, you can set a restore point when removing the invalid DLL's that XP Smoker finds.